An aircraft on a heading of 300 degrees is heading primarily in which direction?

An aircraft heading at 300 degrees is primarily moving towards the northwest. This is because the heading is measured in degrees, starting from true north and going clockwise. A heading of 0 degrees points directly north, while 90 degrees indicates east, 180 degrees south, and 270 degrees west.

When the heading is at 300 degrees, it lies between 270 degrees (west) and 360 degrees (north), which places it in the northwest quadrant. Therefore, 300 degrees indicates that the aircraft is moving in a direction that is predominantly northwest, making it the correct choice.